We aim to find the SFH of two small fields in the halo of NGC 5128 using long period variable stars (LPVs) to better understand the relation between the SFH of the halo and likely recent merger. LPV stars are evolved asymptotic giant branch stars (AGBs) (e.g. [1]}, [2]}; [3]}) which are identified according to high luminosity (1000 to \(60,000\)  \(L_\odot \) ), as well as their variability (\(\sim \)  100 to 1300 days). In addition, red supergiant (RSG) stars are massive stars with a mass up to \(\sim \)  30 M\(_\odot \) , known as a tracer of recent star formation (about \(10-30\)  Myr) in the galaxy with a strong radial pulsation ([4]}; [5]}; [6]}, [7]}).
